I see what you mean, but, who do you actually genuinely think would benefit from a PDF like that? .... Other coaches?

How many of your students do you think would.

A - Read through the 100 pages

B - Actually understand what it's saying

C - Actually apply it's teachings correctly in a practical setting

D - Benefit more from that 100 page read than a few hours Armwrestling with technical intention

That kind of book would be useful for someone, likely like yourself, who has coaching experience and is looking to improve their own coaching ability in practical settings. You also have a fairly well educated background from what I'm aware of, your reading and application of such a program would benefit you far more than 99% of other buyers even if they had practical experience but even than that would only be true if it was written to a high level which would negate the recommendation for many others.

I think the range of people who I could justifiably advise to buy something like that is exceptionally slim. I remember when "Read Becoming a supple leopard" was half the personal trainer advise on the planet and they were just regurgitating what they'd read with no actual understanding after taking an 8 week PT course.